Pump



June 24, 1930. M. PERSONS PUMP Filed July 13, 1925 4 Shegts-Sheet l ew/2A June 1930 L. M. PERSONS 1,765,693

PUMP

Filed July 15, 1925 4 Sheets-Sheet 2 June 24, 1930.-

Filed July 15, 1925 L. M. PERSONS PUMP V 4 Sheets-Sheet 3 June 24, 1930.

L. M. PERSONS PUMP Filed July 13, 1925 4 Sheets-Sheet 4 ter is concerned.

Patented June 24, 1930 UNITED STATES PATENT oF'FicE LAWRENCE M. PERSON S, OF CHICAGO, ILLINOIS, ASSIGNOR TO COOK ELECTRIC GOM- PANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS Application filed July 13,

My invention relates to fuelburning systems and more particularly to a fuel feed pump especially adapted for use in fuel burning systems and having as one of its characteristics the ability to operate automatically upon the withdrawal of fuel therefrom.

In practice, I find that the successful operation of liquid fuel burning systems depends largely on the type and character of the pump used. The manner in which the pump operates is also an important factor. Heretofore, it has been common practice to employ pumps of the plunger and gear types for delivering liquid fuel to the burner, but these pumps soon wear and allow leakage of the fuel, or otherwise admit air into the system. On the other hand, they lack the ability toprovide a uniform supply of fuel, and do not admit of such accurate control in their operation as is required of fuel burning systems. Even vacuum feed pumps have been used to a certain extent, but these require a second pump or prime mover for creating vacuum by which to operate the vacuum feed pumps.

The present invention discloses a pump employing a diaphragm piston of the bellows type, which pump is an improvement over the pump disclosed originall in my (to-pending application Serial Num er 64:1,- 669, filed May 26, 1923 and later disclosed in an improved form in- 00- ending application Serial Number 30,578, led May 15, 1925, of which the present invention is a continuation in so far as certain common subject mat- In my co-pending application, Serial Number 6,545', filed February 3, 1925, I have disclosed an improved means for increasing the capacity of a liquid fuel pump without increasing the operating parts beyond practical dimensions, so as not to require a change in the characteristics of these parts. My invention is concerned, in part, in an improved construction for accomplishing the same result in a very practical, eflicient and economical manner.

It will be remembered that by the use of the bellows type of piston, all sliding or con- 1925. Serial in. 43,064.

' capacity in a single pump. Extensive tests have proved that the best results are obunits of standard dimensions. By increasing the size of the bellows, I do not mean that there can not be some variation, as long as the same general structural design of the pumping unit is adhered to. so far as my present knowledge is concerned, I find that certain advantages may be obtained by standardizing the dimensions.

In practice it is an important feature to have each pump. unit so disposed relative to the pump casin that access thereto may be readily gained for the purpose of repairing or replacing the bellows. The delay incurred in the operation of the pump during this time should be reduced to a minimum so as not to require shuttin down the burner for a considerable period of time. It is one of the objects of my invention to provide a pump having a plurality of pumping units of practically standard sizes arranged to be driven from a single motor, but fundamentally the improvement herein resides in such disposition of the bellows asto render it possible to remove either of the bellows without dismantling the rest of the pump structure. By the provision herein disclosed, such removal of either bellows may be quickly done without an appreciable delay in the operation of the pump.

I find it desirable to drive afuel feed pump for-use in connection with fuel burners, by means of an electric motor, or a like source of power, due to the absence of vacum pressure of an internal combustion c5 tained by increasing thenumber of pump;

pump will start pumping when the liquid therein reaches a pre-determined level. It has been found, however, that the lowering of the liquid level is not always the result of an operating condition inasmuch as leaks frequently occur in the pipe line between the pump and the burner, or the point where the liquid is used or consumed. On the other hand, burners often 'cause an abnormal drain on the ump when the needle valve of the float mec anism of the burner fails to 7 work.

I the If: the fioatwcontrolled switch mechanism closes the circuit when the liquid level drops in the pump, the latter will continue to pump until the level is restored, but when a leak occurs as stated, or the burner places an overload on the pump, this level will not be restored automatically and it is possible for the pump to empty the bulk supply tank before this condition will be observed. In the event of a leak, the possible confiagration of the fuel emptied on the basement floor where the burner is located is clearly apparent. Such fires have been numerous.

One of the objects of my invention is to produce a pump for feeding liquid fuel, say to oil burners and the like, which will eliminate the above referred to diiliculty of the prior art devices by the provision of a safety means of simplicity, which is certain and eflicient in operation and devoid of that delicate mechanism which is apt to require constant attention and frequent repair.

In carrying out my invention, 1' embody aforesaid safety means preferably within a small receptacle connected to the pump, so that when the fuel is entirely withdrawn from the receptacle, or is withdrawn below a pre-determined level, as the case may be, as the result of an overload on the pump, the latter is immediately rendered inoperative. I

In this respect my invention is an improvement over the aforesaid co-pending application, Serial No. 30,57 8, filed May 15, 1925, in which there has been disclosed and broadly claimed, a pump of the type herein shown, and in which pump a novel form of structure is employed for disabling the operation should the fuel be withdrawn therefrom at a rate greater than what is normally controlled by the burner. The present invention provides a ver simple and efficient means for accomplis ing this. result and is ing description when taken in connectionwith the accompanying drawings, formmg a part hereof.

Figure 1 is a side elevational view of a fuel feed pump embodying the features of my invention.

Fig. 2 is a vertical sectional view of this pump taken along lines 2-2 of Fig. 1, and looking in the direction of the arrows.

Fig. 3 is a transverse sectional view taken through the upper portion of the pump, illustrating the method of employing a plurality of pumping chambers havmg bellows pistons therein in a single pump.

Fig. 4 is an enlarged sectional view through a portion of the valve mechanism.

Fig. 5 is a sectional view taken along line 55 of Fig. 3 through the motor housing and pump cylinders; and

Fig. 6 is a sectional view through the intake valve of both pump cylinders.

The pump illustrated in the drawings comprises a plurality of pumping units 3 and 4 suitably carried by motor housing 5, which may be supported upon a tank or receptacle 6. Tank 6 is furnished with a discharge pipe 7 and a supply pipe 8 tending therein from the top thereof. Pumping units 3 and 4 function automatically to supply liquid fuel by way of pipe 8 to receptacle 6 whenever the fuel falls below a predetermined level, such as is indi cated by line A--B in Fig. 2. The arrangement shown herein may be such that the liquid fuel is fed by gravity from receptacle 6 to the burner or other fuel consuming device (not shown). The amount of fuel consumed by the burner is, of course, controlled by the burner itself, say by a float controlled valve mechanism adjacent the mouth of the burner. Provision has been made, however, to disable the operation of the pumping, units 3 and 4: should this demand by the burner or from any point along the discharge pipe 7 exceed the normal supply of fuel in receptacle 6, or that fed to the receptacle by pumping units 3 and 4:. As before explained, there is the possibility of leaks occurring in the fuel 45? Hence, the float serves to The latter is the result of the fuel lUS llt)

- satisfy the requirements of the Underwriters line between the burner and the pump.

1n many instances. Before describing the mechanlsm accomplishing this result, I shall first describe the various structural details of the pumping units-3 and 4 and the common source of power for driving them, which in the preferred form comprises a rotary electric motor 9 suitably embodied in motor housing 5.-

Motor housing 5 may be attached to the top of the receptacle 6 in any suitable manner. As illustrated in Figs. 3 and 5, the side walls of housing 5 are provided with opposed openings 10 and 11. Cup-shaped members or pump cylinders 12 and 13 are mounted over these openings 10 and 11 on the exterior of these side walls of housing 5. Suitable diaphragm pistons of the bellows type may extend into these pump cylinders 12 and 13 to form substantially closed pumping chambers 14 and 15. It will be noted that I have provided the pump cylinders 12 and 13 readily removable by the use of screws 16, which serve to hold these cylinders attached to the housing 5. If a bellows type of piston isused, it may be provided with a peripheral flange 19 which in the present disclosure may be confined between a similar flange 18 furnished on the pump cylinders 12 and 13. Screws 16 may pass through these flanges and into the hous ing 5. If so desired, as a preferred form, the bellows flan e 18 may be in the form of a' ring plate 0, between the which and the housing a suitable gasket may be provided to form a fluid tight connection.

The inner ends of the bellows may be provided with threaded studs 22 which are adapted to thread into the ends of a reciprocating bar 24. This bar serves as a common connection between the bellows, so that they may operate in opposed relation to each other, that is to say, when one of the bellows is pumping or expelling the fuel out of its pumping chamber, the other bellows is sucking the fuel into its pumping chamber. Motor 9 is suitably carried within the upper portion of housing 5, being formed however as an integral part thereof in that the motor is built into the housing 5 and constitutes a part thereof. I

In the drawings, these bellows are disposed along a horizontal axis, while the motor is arranged along a'vertical axis. The lower end of the motor shaft 25 rests upon a ball-bearing 26 suitably carried in a hearing sleeve 27. Housing 5 is furnished with a horizontal support 28 which may be apertured to receive the bearing sleeve 27. A

suitable bolt 29 may be threaded into the lower end of bearing sleeve 27 to serve as a plug and means for carrying the ballbearing 26. The upper end of motor shaft 25 is provided with a ball thrust bearing 25'.

As disclosed in my co-pending application the lower end of motor shaft 25 has a worm 30 formed thereon, which is adapted to mesh with a worm gear 31. Housing 5 is formed with an enlarged portion 32, which is cored to serve as a bearing for a pintle \Vorm gear 31 is suitably fixed on pintle 33, while the outer end 34 of the ,pintle is reduced and secured to the reciprocating bar 24 by an eccentricconnection. Reduced end 34 of pintle 33 is sli htly ofiset from the center of the pintle an engages in an opening 35 in bar 24. A bearing sleeve 36 may be furnished in this opening, if so desired. I wish to call attention to the novel manner of carrying the intle 33 in the portion 32 of housing 5. 5 bearing sleeve 37 is inserted in the core, while a threaded plug 38 may be threaded into its outer end. As will be later explained, the interior of housing 5 is adapted to carry a lubricant kept at a level sufiiciently high to immerse the driving connection and suitably lubricate all of the moving parts. In order that the pump will operate efliciently, I provide a governor 91 of the centrifugal type for holding the motor to its maximum eficiency. I find that a rotary electric motor used as a source of power for driving bellows of the t pe shown in a fuel feed pump has particu ar utility, because the governor can hold the motor to a speed which operates the bellows satisfactorily and yet maintainsthe bellows in use for a longer period of time.

If it is so desired, a valve housing may be forming integrally with a motor housing 5 as shown in'Figure 2. Valve housing 40 is preferably disposed near the top of the motor housing so as to permit the reception of a glass chamber 41 between the valve housing and the top of receptacle 6. Liquid fuel enters the valve housing by Way of an inlet pipe 42 having a suitable nipple connection 42' at its outer end, the other end entering the valve housing to communicate with a passage 43 formed in the latter. Pas sage 43 preferably extends vertically through housing 40. At the lower end of this assage a pipe 44 is adapted to thread into housing 40. The opposite end of pipe 40 passes through the glass chamber 41 and is closed off at the bottom by a suitable closure member 45 threaded to the pipe and holding a cap in position at the bottom of the glass chamber. A plurality of openings 46 may be furnished to permit the fuel to flow into the chamber 41 and rise therein into a cup 47 supported at the upper end of this chamber and provided with a central aperture to permit the fuel'to flow thereinto from where it separates and enters ports 48 and 49.

Briefly described, each side of the valve housing 40 is constructed substantially the same for each pumping chamber 3 and 4. Separate covers 50 and 51 are provided for each side of the valve housing, each cover serving to afford access to inlet and outlet valve chambers 52 and 53. These valve covers are preferably screwed to the valve housing 5 by means of screws 54, so that if it should ever be desirable to replace the inlet and outlet valves 55 and 56, it will not means of the suction created. However,

when the piston expands and forces the fuel out of the pumping chamber, the inlet valve 55 is forced to its seat While the outlet valve is moved upwardly to permit the fuel being pumped to flow into the receptacle 6 by way of the supply pipe 8.

It will be noted in Fig. t'tlrat a com mon passage 57 is provided horizontally through the lower part of valve housing 40. The inner end of passage 57 communicates with a port 58 leading to the interior of the pumping chamber 15. The outer end of passage 57 is plugged oil by means of the screw plug 59. Passage 57 is common to both the inlet valve chamber 52 and the outlet valve chamber 53. In the first instance, a vertical passage 60 provides a communication between passage '57 and inlet valve chamber 52. In the other instance, a vertical passage 61 provides communication between passage 57 and outlet valve chamber 53.

The inlet valve 55 seats, however, in the upper end of a vertical passage 62 disposed substantially adjacent to the vertical passage 60. The lower end of passage 62 is in C0111- munication with the intake port 48 communicating with the cup 47 in the upper end of the glass chamber 41.

On the other hand, the outlet valve 56 is seated at the upper end of the vertical passage'61. This passage, however, communicates through the valve chamber 53, when outlet valve 56 is unseated, with an adjacent vertical passage 61. Passage 61 connects with another passage 63 and then with a pipe 64 entering the receptacle 6 to which the supply pipe 8 is connected.

It will be noted in Fig. 3 that passage 63 is horizontally disposed and that pipe 64 connects therewith slightly at the right-hand side thereof. Passage 61' will be seen in Fig. 3 at the left-hand end of passage 63. As before mentioned, both sides of the valve housing 40 are substantially the same in construction. The passage 61 for the righthand side of the valve housing as shown in Fig. 3 communicates with passage 63 at its right-hand end. Pipe 64 is common to both' sets of valves, but is slightly disposed to the right so as to clear the glass container 41. I deem it unnecessary to explain in detail the construction of both sides of the valve housing because of being substantially the same. In Fig. 3, the section has been taken at different levels in order to facilitate the showing of the various passages, particu larly their relation to one another because of the difficulty of providing a single view showing the relative position of each port and passage. I believe that the showing of Fig. 4 makes clear the exact construction of each side of the valve housing and further believe that a clear understanding thereof may be had by a close inspection of this figure, as well as Fig. 6.

Liquid fuel flowing out of supply pipe 8 enters the receptacle 6 until the liquid level reaches a high level denoted, say, by line A-B shown in Fig. 2. Thereupon the operation of the motor 9 is shut down to discontinue the operation of the pumping units. A switch is provided in the. motor circuit for accomplishing this result. This switch is designated as 65 and is preferably of the mercury type having a pair of electrodes adapted to be bridged by a body of mercury when the switch is in closed position. I prefer to mount mercury switch 65 in a pivotal frame 66 carried in the sides of a depending bracket 67, these sides being apertured to receive pro'ection 67 on the frame 66. An arm 68 pro ects from the rear end of pivotal frame 66. Suspended from arm 68 is a vertical rod 69 extending downwardly substantially the entire length of receptacle 6. It will be noted in Fig. 2 that I prefer extending this rod a short way into the discharge pipe 7. A float 70, adapted to be guided alon'g rod 69 is disposed in receptacle 6. This float serves, of course, to follow the liquid level within tank 6. A buffer 71 secured to one end of the switch frame 66 is adapted to be engaged by the float 7 0 when. reaching its upper limit of movement. Such engagement causes the mercury switch to be tilted whereby the motor circuit is opened.

When the liquid level drops, however. below line A B, the float descends along the rod 69 to permit the mercury switch to close. It will be noted that this mercury switch is preferably pivotally mounted in a manner permitting the same to tilt clown- Wardly to the left by gravity to closed position when the fioatis out of engagement with buffer 71. Hence, when the float drops within the receptacle, the switch will close.

Normally the float remains in a position within the receptacle 6 during the'operation of the pump without dropping to the bottom. That" is to say,.the amount of fuel supplied by both pumping chambers will equal the amount drawn from the receptacle through the discharge pipe 7. If this amount is greater, however, than that supplied, the indication is either a defect in the burner or other fuel consuming device employed, or a possible leak in the fuel pipe be tween the burner and the pump. Notwithstanding which of these two conditions it may be, because in both cases the fuel would flow freely about the floor of the basement on which the burner is disposed and eventually cause a serious conflagration, I desire to provide an arrangement which would immediately disable the pump and'shut off a further supply of fuel to the receptacle 6.

This arrangement is obtained by providing a stop collar 73 near the lower end of stem 69, so that when the fIIGllS almost drawn from receptacle 6, the lower end of the float will engage this stop. I so pivotally mount the mercury switch 65 that the weight of the float on the stem 69 will cause the switch to pivot to open positlon. At this point in the description, it is apparent to those skilled in the art that the same result can be accomplished by other means,

that is to say, a single float may be arranged in many ways in tank 6 so that it will function to open a switch when in both the upper and lower positions and to close the switch while in an intermediate position.

or between the upper and lower positions.

The lead-in-wires 74 to the mercury switch 65 may be brought downwardly through the motor housin 5 in a sleeve of insulation as indicated at T5 and secured to this mercury switch, by a flexible connection as indicated at 76. This flexible connection may be accomplished by inserting the leads 74 into a collar 77 carried by a depending bracket 78 at the upper end of the tank 6. The lead-in wires for the motor 9, on the other hand, may enter the housing through a nipple connection 79, as shown in Fig. 3, and from there through a passage 80 in the interior of motor housing 5 where they may connect directly with the motor in a well known manner.

A further feature of my invention resides in the provision of an improved form of resetting mechanism for placing the pump in a temporary condition for normal operation after the float falling to the bottom of the receptacle to open the mercury switch. With the liquid fuel entirely withdrawn from recepta cle 6, this resetting mechanism functions to lift the float 70 upwardly a short distance pump has been disabled by the so as to remove the weight of the float from the stem 69, as at 73, and thereby permit the mercury switch itself to pivot by gravity to closed position. The motor circuit will then be closed. This mechanism ma be employed to hold said float 70 in the posltion removing its weight from the stem 69 until enough liquid fuel has been pumped into receptacle'6 to'c'ontinue holdlng the float away from the stop 73.

Said mechanism may comprise a'vertical rod 83 extending in the tank 6 with its lower end bent at right angles, as indicated at 84, to a point below the float 70. The other end of rod projects through the top of receptacle 6 and is provided with a knob 85. A stop 86 on rod 83 confines a coil spring 87 between it and the underside of the top of tank 6 so that rod 83 will automatically return to its lower position when released. Knob may be manually engaged to lift the float 70 upwardly a short distance. As

soon as the float is held away. from the,

stop 73 by the fuel being pumped into the receptacle 6 theknob 85'may'be released.

I wish to emphasize the fact that by the use of two bellows, less power is absorbed by the motor governor. ,Two bellows throw a greater bellows load on the motor, thereby resulting in practically double efliciency as compared to a pump with a single bellows. Almost double the volume of oilis pumped with practically the same current consumption.

Glass chamber 41 may serve as an indicator for indicating a leak in the suction pipe leading to the intake of the pump, by the air bubbles rising therein. It also provides an air cushion to the intermittent action of the pump units 3 and 4.

Where desired, an oil cup 91 may be furnished to provide lubricating oil to the interior of motor housing 5 and the bellows. Cup 91 communicates with a vertical passage 92 leading to a horizontal passage 93. As illustrated in F ig, 3, passage 93 communicates with the interior of motor housing 5. No exact level may be maintained, but it is preferable to keep the lubricant at a height which will thoroughly lubricate the worm 30 and other operating parts. A suitable amount of lubricant will work its way through openings 10 and. 11 into the interior of the bellows. I find that with oil in the bellows, their life is greatly increased.

From the foregoing description,it will be readily apparent that an abnormal demand of fuel caused either by burner or by a leak in the fuelline will immediately cause the float to open the switch and break the motor circuit, and to thereby prevent a serious conflagration of fuel that may flood the basement floor where the burner is located. Such an arrangement is particularly unique in cases where the owner of a building may wish to leave the premises for several days and may then set theroom thermostat (not 7 shown) to maintain a certain temperature unnoticed too long.

whereby to prevent the pipes of the house from freezing. Underwriters have found that it is during such periods of absence from the premises that leaks occurring in the pipes between the burner and the pump flood the basement and cause serious fires, because those leaks at such times. usually go The cause of many fires in buildings having fuel burning systems installed therein is traced directly to leaks of the character ture of providm mentioned.

I wish to emphasize the fact that the'feaa tripping acting mechanism capable o. rendering the pump inoperative, when an excessive demand is made at the outlet of the pump, may take many forms other than that illustratedand described herein. The same result might be accomplished by mechanisms other than the t pe controlled by a float, and consequently, do not wish to be limited to any particular form of construction.

It will also be readily apparent that I am I the first to suggest arranging aplurality bellows pumpingunits in a manner permitting them to be quickly removable, without requiring, other parts to be at the same timed isconnected. When it is desired to remove either unit, bolts 162, are unthreaded which I frees the pump cylinder from the sideof the motor housing. The bolts pass through the "flange of the bellows, but the latter will not be released from its mounting untilit is turned several times to unthread it from the reci rocating bar 24 extending interim-1y in the pump in the removal of either bellows.-

the ellows. Hence, it will be seen'th'at but two parts are required to be removed from I consider this an im ortantfeature, because it increases the practical utihty of my pump.

Various other embodiments andodifications of my inventionv will be 0 vious to J those skilled in the art and consequently I do not intend to be limited tothe details herein described and illustrated.

. I claim 1. In a pump adapted to supply liquid to a receptacle, the combination 0 a housing, a

, plurality of pump units each individually mounted thereon and comprisinga cylinder and a piston operating. therein, each being detachable at the exterior of said housing, a driving connection for said istons, and a motor within said housing and between said pumping units for actuating said driving connection.

2. In a pump adapted to supply liquid to a receptacle, the combination of a housing adapted for association with said receptacle, a plurality of transversely disposed pump units, said pump units being removably mounted on the exterior of said housing and detachable without access to the interior of said housing, and a motorin said housing and substantially between said pumping unitsfor operating said pumping units.

3. In a fuel feeding device,'the combination offja receptacle for receiving liquid fuel fed thereto by a plurality of pumping units, each unit comprisinga substantially closed pumping chamber into which a bellows pishousing, a pair of pumping chambers and a common connection leading therefrom to said receptacle, each chamber having a pas,- sage m communication with said common connection and a valve for controlling the flow of liquidfrom'said passage to said common connection, an inlet connection, and a valve between said inlet connection and each 10f said passa es.

' 5. In a liquid feedingdevice, a receptacle, means for pumping li uid thereto comprising a pair of pumping c ambers, motor drivenplstonmembers operating in said .chambers, inlet and outlet connections therefor anda sin 1e passage between each. chamber and sai inlet and outlet connections.

. 6. In a feul feedingdevice, a receptacle I for receiving fuel supplied thereto, a motor housing adapted for, association with said receptacle, a pair of suction chambers car,-

ried by said housing, pistons in said chambers operably connected to a motor mounted within said housin and a valve housing ad- 'acent said motor ousing, said valve housmg provided with passages for communicating with said chambers.

7 In a liquid feeding supplied thereto, a motor housing adapted for association with said receptacle provided 'with openings in the walls thereof, pump? cylinders mounted over said openings on'the exterior of said walls, pistons in said cylinders, a reciprocating connection within said housing for actuating said pistons, a rotary electric motor within said housing, and means for converting the rotary motion of saidmotor into a reciprocation motion for driving said connection.

8. In a fuel feeding device, the combination of a housing provided with openings 'over which cylinder casings are ada ted to be secured, horizontally disposed ellows device, the combinetlon with a receptacle for receiving liquid pistons adapted for actuation in said cylinder casings, a motor carried by said housing, anoperating element connecting said motor to said pistons, the interior ofsaid bellows communicating with said housing to-permit the retention of a body of lubricant therein for the movable parts thereof.

9. A pumping unit, having in combination, a motor housin having substantially parallel opposed wal s, and a transversely disposed partition interconnecting said walls, an electric motor mounted between said walls with its rotor and shaft supported by said partition, said walls having openings therein, a driving connection ex-' tending through said housing at, said openings and driven by said motor, and pumps externally mounted on said walls and operated by said driving connection. f

10. A pumping unit, having in combination, a motor housing having vertical walls I interconnected by a horizontal partition member, a vertically disposed electric motor mounted between said walls and supported by said partition member, pumps mounted externally on said walls and transversely arranged with respect to the vertical axis of said motor, and a driving connection between said motor and said pumps.

11. A pumping unit, having in combination, a motor housing having vertical walls interconnected by 'a horizontal partition member, an electric motor mounted between said walls and sup orted by said partition member, said walls aving' openings therein, 1

a pair of. pump chambers mounted externally on said walls over-said o enings, an

extensible and contractible pumping element in each chamber, and a driving connection between said pumping elements and driven by said motor.

12. A pumping unit, having in combination, a motor housing comprising opposed walls and a partition interconnected between said walls, a motor dis osed within said housing and supported y said partition, and a removable ump mounted externally on each wall and riven by said motor.

13. A pumping unit, having in combination, a motor housing comprising side walls and a partition interconnected between said walls, a motor disposed within said housing and supported bysaid partition, a removable pump chamber and piston therem mounted externally on each wall and a common driving'connection driven tor and extending from each side of said housing for operating said pistons.

14. A pumping unit, having in combination, a motor housing comprising side walls,

said walls having openings" therein, a mo-' tor in said housing, a commondriving con nection driven by said motor and extending outwardly through said side walls, and a re-' movable pump externally mounted on each said moconnection extending through said openings.

16.. A pumping unit, having in combination, a motor including a rotor and a shaft therefor, adapted to be operated with the shaft vertical and including a frame member supporting said rotor, a pair of pumps oppositely disposed on the housing of said motor, and a driving connection extending through the motor housing to said pumps.

17 A pumping unit, having in combination, a motor including a housing having a field shell, end frames and a rotatable member including a shaft journaled in said end frames, a pump disposed on the exterior of said field shell, and a driving. connection extending from said shaft through an opening in said field shell to said pump.

18.-A pumping unit, having in combina- 7 ber, including a shaft jonrnaledin said end 9 frames, a pump mounted on said field shell having an axis transverse to the axis of said. shaft, and a drivin connection extending along the axis of said pump and driven by said shaft. 7

19. A pumping unit, having in combina tion, a motor including a housing having a field shell, end frames and a rotatable member including a shaft journale'd in said end frames, and a plurality of pumps disposed along substantially the same axis and provided with a common driving element,

said driving element being transversely disposed relatlve to said shaft.

20. A pumping unit, having in combination, a motor including a housing having a field shell, end frames and a rotor adapted to be operated with its shaft vertical and journaled in said end frames, oppositely dis osed pumps attached to said field shell, an a driving element extending between said pumps and passing through said field shell, said pumps-and said driving element having a substantially common axis.

In witness whereof I have hereunto subscribed my name.

. LAWRENCE M. PERSONS. 

